FBX option from import is missing
I have the same problem . 
But i accidentally found a solution so I thought  I should share it. 
The  import export options like . Fbx  etc are missing In layout workspace, if you switch to modeling you will find all the other import export options. 
Same in case of  exporting uv layout, it's missing if you open a window and use uv editor but it's present in uv editing workspace.